One striking comment from the article: Last month, a 17-year-old girl died at the Victoria Warehouse nightclub in Salford after allegedly taking one “MasterCard” ecstasy pill. Measham said she had tested MasterCard pills at Parklife containing 250mg of MDMA, the active ingredient in ecstasy. A standard dose for an adult for one night is 80-100mg, "

Did you read that? 1 pill killed this young woman!

It seems that no one really knows what each pill contains, therefore you cannot really be sure!